Yes, 13 months. 10 months for contempt of court and a further three months for breaching the terms of a previous suspended sentence. I didn't realise the video had been taken down, but the Guardian article explains the restrictions put in place temporarily.

Former EDL leader Tommy Robinson spends first night in prison, converts to Islam.

"As one prison guard explained the incident. They told us, “I’ve seen it many times, these radicals seek out the weak minded, those with a feeble intellect, and before you know it they’re reciting the Koran all day long, calling themselves Mustafa, and growing a beard."

Former EDL leader Tommy Robinson spends first night in prison, converts to Islam.

"As one prison guard explained the incident. They told us, “I’ve seen it many times, these radicals seek out the weak minded, those with a feeble intellect, and before you know it they’re reciting the Koran all day long, calling themselves Mustafa, and growing a beard."

There's a character in the film Four Lions who was an ex-Nazi who self-radicalised himself by reading the Koran. He was supposedly based on a real person but I don't know details of the "real" case.

I recall reading long ago that in the 1930s the Nazis discovered that they recruited far more successfully from among the active communists than anyone else. It seems that a certain personality type is attracted to extremism, and what kind of extreme doesn't matter that much.